Universe

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Across
  1. 2. A light year is the distance light travels in 1 year about 9.5 trillion (blank)
  2. 4. (blank) sensing instruments are essential for studying the far reaches of the universe
  3. 6. Visible blank is a form of electromagnetic radiation
  4. 7. includes everything that exist
  5. 10. occurs as objects move farther away form a source and the light shifts toward red
  6. 11. scientist have (blank) that the universe is about 13.7 billion years old
  7. 12. scientist are looking into the (blank) when observe electromagnetic radiation in space
  8. 13. the expanding universe is similar to a (blank)
Down
  1. 1. the universe includes all matter energy space and (blank)
  2. 3. electromagnetic radiation such as radio waves (blank) and infrared radiation
  3. 5. The big bang (blank) is the most widely accepted theory to explain the universe
  4. 6. is the fastest thing in the universe
  5. 8. (blank) telescopes similar in appearance to satellite dishes
  6. 9. the universe continues to (blank) to this day